davidson



(No Modl.) 2 Sheets-Sheet 1. J. DAVIDSON. BIGYGLB LOCK.

Patented June 8,1897.

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J. DAVIDSON. BICYCLE LoGK.

No. 583,893. Patented June 8, 1897.

UNITED STATES PATENT OFFICE.

JOHN DAVIDSON, OF LONDON, ENGLAND, ASSIGNOROF ONE-HALF TO JOHN ROMBACH, OF SAME PLACE.

BICYCLE-LOCK.

SPECIFICATION forming part of Letters Patent No. 583,893, dated June 8, 1897.

Application tiled November 2S, 1896. Serial No. 613,822. (No model.)

To all whom, t may concern:

Be it known that I, JOHN DAVIDSON, clockmaker, asubject of the Queen of Great Britain, residing at 272 Friern Road, East Dulwich, London, in the county of Surrey, England, have invented certain new and useful Improvements in Locking Devices for Cycles, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to locking devices for preventing the unauthorized use of cycles. According to the said invention a lock-case is provided having Within it a spring-controlled barrel on which is wound a chain, band, or cord. One end of said chain or cord is attached to the barrel and the other end projects through an opening in the case and is attached to the right-angular perforated piece, which is too large to pass through said opening, so that the chain cannot be completely retracted into the case lby the spring. The said end piece is also adapted to be locked to the case by a spring-catch or snap-lock when inserted in a slit in the case. The case is furnished with a clip or clips adjustable or otherwise, whereby it can be attached to a convenient part of the frame of the cycle.

In the drawings accompanying and forming part of this specification, Figure l is a rear elevation of the lock as applied to the fork of the rear wheel of a bicycle, portions only of the fork and of the wheel being shown and the locking-chain being engaged with the wheel. Fig. 2 is a front elevation showing the provision for adjusting the lock-supports. Fig. 3 is a view similar to Fig. l, but with the face-plate ot' the lock-case removed to show the internal construction of the lock; and Fig. -l is a plan view of the lock.

Similar characters designate like parts in all the figures of the drawings.

A is the loclecase.

B is a barrel mounted loosely on a pin B' within the said case and controlled by a spring B2.

C is a chain having one end attached to the ,barrel and the other end projecting through an opening A' in the side of the case and attached to an end piece D, which is too large to pass through said opening. The said piece D is of rightangular form, and one arm thereof serves as a convenient handle when the chain is to be drawn out and also as a stop to prevent the piece from being drawn within the case, and said piece also serves to lock the chain, as hereinafter described.

E is a catch having a hook e at its forward end, said catch being pivoted at E and controlled by a spring Opposite the said catch is a slit or opening A2 in the case, through which opening the end piece D is introduced when it it is desired to lock it to the catch, one arm of said piece D being suit ably perforated at D' (see Fig. 4) to engage with the hook e of the catch and the other arm serving as accnvenient handle.

E3 is a stop to prevent the catch moving to a position Where the piece D could not engage with it. i It will be seen that the end piece D becomes locked on being simply inserted in the slit A2, as hook e immediately flies into perforation D of said piece. To unlock it again, the catch must be operated by a key inserted in a keyhole K in the case.

The case A is supported by clips F F,which clasp a suitable part of the frame ofthe cyclefor instance, the two branches G Got the fork ot' the back wheel-and which are secured by bolts F F or otherwise. Each clip F is provided with a comparatively wide stem or eX- tension slotted at F2 and with bowed spring or clipping portions having parallel ends f f, through which clamping-bolts F are passed, said bolts being equipped with the usual nuts. The slotted arms are passed over the stem of a bolt H, projecting from the case A, and are freely adjustable to suit the divergent portions of the fork G, whereby they can be attached in any desired place thereon orto lit diierent machine-frames. After the clips have been attached to the fork by the bolts F F' and the nuts carried thereby the nut on bolt l-l is turned up and iirmly secures the clips and the case together.

The operation of the device is as followsthatis to say, the device havingbeen attached to the fork G the chain O is drawn out and passed through the wheel .l between the spokes, and the end piece D is then inserted in the slit or opening A2, and thereby engaged with the catch E and locked to the case. The

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spring-barrel always draws the chain tight. The cycle cannot be used again until the chain is unlocked, which is effected by a suitable key inserted in the keyhole K and turned to move the catch, whereupon the end piece D can be withdrawn, and the chain is then by the spring rewound on the barrel.

'Ihe said invention is applicable to any cycle, Whether it has two or more Wheels, the case A being attached to any suitable part of the frame, conveniently near one of the Wheels.

Having described my invention, I claim" Thecombination, with a case, of clips for connecting the same to a cycle-frame, each 

